Move CtsHostsideNetworkTests to group presubmit-large

The test config takes longer than 15mins to run. Move it to a dedicated
group for running slow presubmit Test Mapping test.

Some more context is in the referenced bug, e.g, b/174495337
The group will work exactly the same as presubmit for now.

Bug: 174654670
Bug: 174495337
Test: none
Change-Id: I31c41728e1ce1dcc475acff43a451084ecc7c542

services/core/java/com/android/server/net/TEST_MAPPING

@@ -1,5 +1,5 @@
 {
-  "presubmit": [
+  "presubmit-large": [
     {
       "name": "CtsHostsideNetworkTests",
       "file_patterns": ["(/|^)NetworkPolicy[^/]*\\.java"],
@@ -11,7 +11,9 @@
           "exclude-annotation": "androidx.test.filters.FlakyTest"
         }
       ]
-    },
+    }
+  ],
+  "presubmit": [
     {
       "name": "FrameworksServicesTests",
       "file_patterns": ["(/|^)NetworkPolicy[^/]*\\.java"],